JP2002282916A - Operation method for rolling path and rolling path control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain conformity to especially narrow dimensional tolerance in manufacturing of a profiled rolling material at a relatively low manufacturing cost, in an operation method for a rolling path. SOLUTION: By comparing a measured profile (54) of the rolling material in process with a target profile, then based on a deviation of a measured profile from the target profile, modified target values (Ki ) in relation with weight factors (Wi ) inherent to each stand are replaced with the target values (SW) for entire rolling stands or each stand (4, 6, 8).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for operating a rolling path of a deformed rolled material, comprising a plurality of rolls continuous in a rolling direction and each having a plurality of work rolls. The invention relates to a method as described above, wherein the method is guided by rolling stands and each rolling stand is set to a plurality of target values for its operating parameters. Furthermore, the present invention
The invention also relates to a rolling path control system of this kind.

[0002]

2. Description of the Related Art In order to roll a rolled material, a plurality of rolling stands may be used in a rolling path. These rolling stands are provided for penetrating a rolled material which is usually long, and are arranged in series or continuously when viewed in the forward direction of the rolled material, also referred to as the rolling direction. A rolling path provided with a large number of rolling stands of this type is used particularly when processing a deformed rolled material. The deformed rolled material has, in particular, a so-called "troubled profile" and is formed as a U-shaped profile or a double T-shaped beam.

[0003] When processing a rolled material of this type, a so-called universal stand is usually used at least in part. Rolling stands of this kind, which are designed as universal stands, usually operate in pairs.
It has two horizontal rolls, which cooperate to form a rolling gap which determines the web thickness of the resulting double T-beam. On its side in the rolling direction, two opposing vertical rolls are arranged inside the universal stand so as to lie between these horizontal rolls, these vertical rolls limiting the rolled material laterally. The vertical roll is important in forming the overall width of the double T-beam together with the horizontal roll body length.

When operating a rolling stand of this kind, in particular a rolling path with a universal stand, it is usual to apply a target value to each rolling stand for a plurality of parameters thereof. These target values are chosen such that the finished rolled product is as close as possible to the target profile with respect to its profile. In this case, the adjustment value is set directly for the adjustment value acting on the adjustment element of the rolling stand, i.e. for example for hydraulic pressure for setting the desired rolling force, or for the desired positioning of the roll. Set for the adjustment value. However,
In modern rolling mills, these are also set for derived relatively complex adjustment values, for example for the rolling nip, and such adjustment values are adjusted in a subordinate adjustment to the appropriate operating parameters. Converted to a value.

[0005] In any case, the finished rolled product is subject to relatively narrow boundary conditions or tolerance limits with respect to the target profile for high precision production of rolled material. It is difficult to maintain relatively narrow tolerance limits, and in particular to maintain tolerance limits by changing as much as possible during the rolling process external conditions, such as, for example, ambient conditions or the characteristics of the incoming rolling material. Have difficulty. Therefore, in order to maintain relatively narrow tolerance limits, it is usually necessary to continuously monitor the rolling process and to operate the associated controls at every opportunity. However, accuracy is limited in this case. Furthermore, the production of such profiled strips is particularly expensive in order to maintain relatively narrow tolerance limits.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of operating a rolling path of the kind described above, in which the production costs can be kept relatively low and a particularly narrow tolerance limit in the production of deformed rolled material can be maintained. It is to be. Another object of the present invention is to provide a control system for a rolling path of this kind, which is suitable for carrying out the method.

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided, in accordance with the present invention, a method for detecting a profile of a rolled material that has run out, comparing the profile with a target profile, and determining based on a deviation of the detected profile from the target profile. This is achieved by applying a modified setpoint to the setpoints or setpoints of the or each rolling stand with respect to stand-specific weight factors.

The idea from which the invention starts is that the profile is continuously monitored in order to maintain narrow tolerance limits, especially when the rolled material is irregular, and the evaluations made at that time are made as soon as possible. Especially when the rolling process is still ongoing. In this way, the deviation of the actually formed profile from the predetermined target profile is taken into account while the rolled material is still being manufactured, and the actual profile is set by setting an appropriate correction value to the target value. Can be corrected. The correction value is set as an additional target value and is taken into account in the control if there is a suitable measurement for the actual profile. The addition of the additional target value can be performed in synchronization with the length, that is, by setting an additional target value for a comparable rolled material length position in advance, or in synchronization with time. That is to say, this can be done by simultaneously presetting additional target values for the individual rolling stands.

Particularly high accuracy can be achieved if the error is corrected as directly as possible at the place where the error occurs and the target value is controlled to follow. In this case, the recognition that the present invention particularly considers is that any deviations in the profile of the rolled material after manufacture that exceed the tolerances are due to various causes, that is, each of the rolling stands passing therethrough. From the rolling path, and accumulate in products coming out of the rolling path. Such a cumulative effect on the deviation from the target profile is appropriately corrected by particularly simple means and in particular by using only one measuring system for detecting the actual profile of the manufactured strip. be able to. For this reason, the corrective actions required due to the overall deviation from the target profile are taken into account for each rolling stand, taking in the experience of the previous rolling process, or taking in the system-specific expertise of the individual rolling stands. Distribute. This kind of experience and / or expertise is held in stand-specific weighting factors, based on which the overall corrections to be made to the profile of the rolled material are determined by the individual rolling stand target values. Appropriate distribution to the modification. In this case, the weight factor is a kind of "learning function"
Or as an auto-optimization function, supplemented continuously or at regular intervals,
If necessary, this will be supplemented in light of the experience of the last several rolling processes.

In order to maintain a particularly narrow tolerance limit, it is sufficient that the tension / compression ratio of the rolled material between successive rolling stands is constant. To assist this, it is advantageous to exchange data between stand pressure reduction control and tension / compression control under the action of the modified target value.

The output of the correction value relative to the target value is advantageously effected in particular relatively close in time (zeitnah) or almost simultaneously, that is to say by means of a kind of "on-line tracking control". In particular, while one roll stand is processing a rolled material (the already rolled area (rolled material head) has already been provided for evaluation), the tracking control of the target value for the unrolled part is performed. You can do it. The correction target value provided for this purpose should expediently take into account the relative parameter changes that occur between the worked part of the rolled material head and the central part of the rolled material.

[0012] The method according to the invention is particularly suitable for operating a rolling path for producing double T-beams. This type of rolling path has at least some so-called universal stands, each universal stand having a horizontal roll pair and a vertical roll pair. In such a rolling path, particularly narrow tolerance limits can be set by applying appropriate modified setpoints to setpoints for operating parameters such as web thickness, flange height and / or flange thickness of the rolled material. It is advantageous to optimize the target value so as to maintain it. Double T
The profile of the shaped beam can be described substantially by a central part in which the respective laterally extending flanges are integrally formed. Thus, a double T-beam is almost completely described by its web thickness, flange height, and flange thickness. In this case, the adjustment of the web thickness can be effected in particular by adjusting the corresponding rolling gap between the horizontal rolls of the universal stand. In this case, the universal stand may be controlled in such a way that a target value for the web thickness is set, but this target value is set, for example, for the individual horizontal rolls inside the adjusting element assigned to the universal stand. It is converted to an appropriate derived operating parameter such as a position adjustment value.

In another preferred embodiment, the weight factor specific to each stand is set as a function of the rolled material. This takes into account additional perceptions, i.e. the influence of the individual rolling stands on the total deviation of the profile actually formed from the strip target profile depends only on the position of the respective rolling stand in the rolling path. It does not depend on the type of rolled material to be manufactured. Therefore, the correction target values acting on the respective target values for the rolling stands, and in particular, the stand-specific weighting factors on which the correction target values are based, are set in view of the type of rolled material to be manufactured.

The horizontal rolls of a rolling stand, each cooperating in pairs, may be reduced together. in this case,
The cooperating rolls are evenly and symmetrically urged by an adjustment amount, such as a draft pressure. Thereby, the center pointing to the reference plane is automatically generated. On the other hand, on the other hand, in one or several rolling stands, the pair of cooperating horizontal rolls may be separately lowered. In this way, the rolls can be positioned independently of each other, so that the absolute position of the rolling gap formed by these rolls with respect to a reference surface (for example, a rolling surface) can be changed. In order to make the additional flexibility achievable thereby available also available, in particular for tight tolerance limits, by providing new degrees of freedom, in a particularly advantageous configuration, the rolls are adjusted with respect to the roll-specific setpoints. In a rolling stand operable independently of one another, a correction target value is applied to the or each setpoint value of the roll with respect to the roll-specific weight factor, based on the deviation of the detection profile from the target profile. In this way,
The concept of correction according to the cause of the rolling error is maintained not only between the roll stands, but also between the rolls which can be independently lowered within one rolling stand.

In order to overcorrect the rolling error and to avoid exceeding other tolerance limits unrelated to the respective target value, the corrected target value or each corrected target value is determined by the parameter-specific maximum value. It is expedient to limit to In another alternative to this configuration or in addition to this configuration, a correction target value for horizontal reduction of one rolling stand and a correction target value for vertical reduction are set. The target value ratio is limited to a maximum value that can be set in advance.

In order to make the experience values of the past rolling operation particularly advantageous, the correction target values or the respective correction target values and in particular the stand-specific weight factors are determined on the basis of the rolling results of the past rolling process. It is advantageous to set them in advance. In this case, a number of past rolling results may be evaluated, for example, as to which characteristic values of the rolling stand led to relatively particularly favorable or particularly undesirable rolling results. The recommendation to the operator for the correction of the rolling gap, or preferably automatically, is made, in particular, when the sum of the correction target values exceeds a presettable limit value. In such a case, the result of the immediately preceding rolling process, in particular, the result of the current rolling process, may be included in the evaluation with relatively high weight. Such a consideration of the past rolling results, in a particularly advantageous configuration, can be made as a kind of presetting or as a “presetting value”, and the newly entered rolled material (evaluable actual values are not yet available). Rolled material not provided)
Modifications of the standard setpoints have already been made based on previous machining experience. In this case, it is particularly advantageous to target the measured values of a previously rolled material, in particular of a reliably rolled longitudinal region (fillet pieces).

When a double T-shaped beam is manufactured, a so-called reversible rolling method may be applied during rolling. In such a case, the rolled material passes through a plurality of successive rolling stands in the rolling path many times like a kind of pendulum movement. After first piercing each rolling stand,
The rolled material is stopped and guided so as to newly pass through the respective rolling stands in the opposite direction. This process is repeated a preset number of penetrations (also called stitches) until the rolled material is finally fed to another part of the rolling path for further processing or to finish the rolling step. Is done. When the rolled material is penetrated a plurality of times in this way, the detection of the actual profile between the target profile to be achieved and the tracking control of the target value derived therefrom are performed for the multi-penetration rolling stand. Useful for maintaining tight tolerance limits. Therefore, in another particularly advantageous configuration, when a rolled material is made to penetrate the rolling path a plurality of times, the respective correction target values are set in advance in consideration of the past through-rolling results. Therefore, the corrected target value is
As a kind of adaptation treatment, the first influence characteristic of the past rolled material and its stitch or penetration, and the second influence characteristic of the current rolled material and the past penetration or stitch are used. Assembled.

[0018] This type of adaptation is configured in connection with rolling stitches and also in connection with rolled material. Such an adaptation enables a particularly rapid reaction or correction when a rolling error occurs. In this case, in order to detect the rolling profile of the rolled material after one pass, the measuring device for detecting the profile of the rolled material on both sides of the rolling stand through which the rolled material is passed a plurality of times when viewed in the rolling direction. May be arranged. But a particularly simple construction is
The point is to provide only one such measuring device. This single measuring device is expediently arranged after the last rolling stand through which the rolled material is passed several times. In an arrangement of this kind, the adaptation after "stitch x", i.e. the evaluation of the actual profile after having penetrated each rolling stand x times, is for "stitch x + 2", i.e. x + 2 of the rolling stand. This is done for the second penetration. In this case, the expected value for the x + 1 th reverse penetration is based on the actual measurement for the x th penetration, so that the reverse penetration, ie the x + 1 stitch or penetration, can be performed without any particular error. Is advantageously interpolated.

[0019] With regard to a control system for a rolling path for deformed rolled material, wherein the rolled material is guided by a plurality of rolling stands which are continuous in the rolling direction and each have a plurality of work rolls, The object of the invention is to provide a control unit for presetting the target values of the operating parameters for the adjustment elements assigned to one rolling stand, the control unit detecting, on the input side, a profile characteristic value of the rolled out rolled material. Connected to the device and the memory module, the control unit determines, based on the deviation of the detected profile characteristic value from the target profile characteristic value, a target value for each rolling stand for a stand-specific weight factor stored in the memory module. The problem is solved by applying the correction target value.

The advantages obtained by the present invention are particularly as follows. In examining the correction target value for the target value of the rolling stand, by taking into account the weight factor specific to the stand, it becomes possible to make correction according to the cause when the rolling path is operated.

In this case, the rolling error accumulated in the rolled product running from the rolling path and present in the form of a total shift (total shift) is determined by taking into account the technical knowledge unique to the apparatus, the individual rolling stands or individual rolling stands. Reduced to the individual influence of the roll. The weight factor or its influence can be determined and limited in particular by the expertise in roll technology. In this case, a particularly accurate compensation of the errors is possible at a relatively low cost, so that particularly narrow tolerance limits in the production of the profiled rolled material can be maintained. This requires particularly little operator intervention and does not require relatively frequent sampling of the rolled material. As a result, the stopping time of the rolling path due to exceeding the tolerance is shortened, so that the rolling path can have a particularly high yield as a whole.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The rolling path 1, a part of which is shown in FIG. 1, is provided for producing a deformed rolled material. For this purpose, the rolling path 1 has a number of rolling stands which are continuous in the forward direction or the rolling direction x indicated by the arrow 2, and among these rolling stands, the first rolling stand 4 and FIG. The second rolling stand 6 and the third rolling stand 8 are indicated implicitly by their respective rolls. In the rolling path 1, in addition to the rolling stands 4, 6 and 8, another rolling stand may be provided on the upstream side or the downstream side. In this case, in particular, the rolling direction x
, A rough rolling stand can be provided upstream of the first rolling stand 4, and a precision rolling stand can be provided downstream of the third rolling stand 8.

In the embodiment of FIG. 1, the rolling stands 4 and 8
Is configured as a so-called universal stand. For this reason, the first rolling stand 4 has a pair of horizontal rolls 10 and 12 laid vertically, and the horizontal rolls 10 and 12 form a rolling gap for a material to be rolled extending in the vertical direction. ing. The horizontal rolls 10, 12 are rotatably supported by stand elements via roll axes 14 or 16 in a manner not shown. The first rolling stand 4 further has a pair of vertical rolls 18 and 20 that are disposed between the horizontal rolls 10 and 12 so as to be laterally offset from the guide path of the rolled material. The vertical rolls 18, 20 are
A rolling gap defined by the running surface and the side surfaces of the horizontal rolls 10 and 12 is formed. Correspondingly, the rolling stand 8, also configured as a universal stand, also comprises a pair of horizontal rolls 22,24 and a pair of vertical rolls 26,2.
8 is provided.

To further clarify the construction, a first rolling stand 4 configured as a universal stand is shown in cross section in FIG. As can be seen particularly clearly from FIG. 2, the rolling gap 30 formed by the horizontal rolls 10, 12 determines the web thickness of the double T-beam passing through as rolled material. The roll shaft 14 of the horizontal roll 10 is supported on one side by a hydraulic cylinder unit 32 or 34. The hydraulic cylinder units 32, 34 are fixedly attached to the stand legs in a manner not shown, and can be urged by a working medium to adjust the roll position. The energization of the hydraulic cylinder units 32, 34 is performed via an adjustment element not shown in FIG. The adjusting element depends on the input value given in advance, and the hydraulic cylinder units 32, 34
Set the pressure of the working medium inside. The input value is a target position for the horizontal roll 10 or a target value for a rolling force acting on a rolled material guided by the rolling stand 4 with the horizontal roll 10. Correspondingly, the second horizontal roll 12 is supported on one side by a hydraulic cylinder unit 36 or 38 via its roll shaft 16 respectively.

As can be seen from FIG. 2, the vertical rolls 18,
20 is a roll shaft 14 on both sides of the horizontal rolls 10 and 12
And 16 are arranged. Vertical roll 18,20
Together with the side surfaces of the horizontal rolls 10 and 12 attached thereto form rolling gaps 39 extending in the horizontal direction. In this case, both the rolling gaps 39 are formed together with the body lengths of the horizontal rolls 10 and 12. , The width B of the rolled material guided by the rolling stand 4. Vertical roll 1
8 and 20, together with the holding elements 40 or 42 and the hydraulic cylinder units 44 or 46 respectively assigned thereto, are supported by rolling stands.

In the present embodiment, the second rolling stand 6 provided between the first rolling stand 4 and the third rolling stand 8 when viewed in the rolling direction x is a pair of horizontal rolls 5.
It has only 0.52. The horizontal rolls 50, 52 extend longer than the horizontal rolls 10, 12, 22, 24 of the first rolling stand 4 or the third rolling stand 8 when viewed in the longitudinal direction.

The portion of the rolling path 1 shown in FIG. 1 is constructed in its entirety for producing a deformed rolled material as a double T-beam. FIG. 3 shows a profile 54 of such a double T-beam with the relevant parameters described. Double T-beam profile 5
4 has a web 56 in its central area, in which S is the web width of the web 56. The web 56 is integrally formed with a flange 58 or 60 on one side, respectively. The flange height characterizing each flange 58, 60 is indicated by a double arrow 62 in FIG. In addition, the flange 58,
Each 60 is also characterized by a flange thickness FD. For the description of the profile 54, in addition to its full width B, the manner of positioning the web 56 with respect to the upper or lower edge of the flanges 58, 60 will be used. This positioning manner is characterized by the length L in FIG.

These operating parameters which characterize the profile of the rolled material 54 are influenced entirely by the rolling stands 4, 6, 8 of the rolling path 1, as described below.
The web width S of the web 56 is substantially determined by the rolling gap 30 between the horizontal rolls 10, 12 of the first rolling stand 4 or the horizontal rolls 22, 24 of the third rolling stand 8. For the finished rolled product, in particular, the horizontal rolls 22, 2 of the rolling stand 8 passing last.
The rolling gap of 4 is important. Width B of profile 54
Is given by the sum of the rolling gaps 39 between the vertical rolls 18, 20 of the first rolling stand 4 or the vertical rolls 26, 28 of the third rolling stand 8, and of the respective horizontal rolls 10, 12 or 22, 24. Also given by the trunk length. The final width B of the rolled profile 54 is also substantially determined by the above parameters of the third rolling stand 8 that passes last. The flange height FH is substantially determined by the rolling gap between the horizontal rolls 50, 52 of the second rolling stand 6.

The rolling path 1 is designed to maintain a predetermined target profile particularly accurately in the production of the deformed rolled material, that is, to keep the tolerance value particularly small. For this reason, a control system 70 is provided on the rolling path 1. Control system 70
Includes a central control unit 72, which is connected on the output side to a plurality of adjusting elements 74, 76, 80 for the rolling stands 4, 6, 8. On the input side, the central control unit 72 is connected to a measuring device 82 for detecting deformed characteristic values of the rolled material. Further, the central control unit 72 is provided with a memory module 84 capable of accessing the central control unit 72 for reading or storing data, and an input / output module 86 (for example, a personal computer).

An adjusting element 74 is attached to the first rolling stand 4. The adjusting element 74 comprises hydraulic cylinder units 32, 34, 36, 3 of a total of four horizontal rolls 10, 12 and vertical rolls 18, 20 of the first rolling stand 4.
The adjustment value is sent to 8, 46, 48. This was indicated by four arrows. To generate a plurality of adjustment values, the adjustment element 74 is divided into a plurality of sub-groups or modules, each of which is assigned to one of the horizontal rolls 10,12 or one of the vertical rolls 18,20. ing. In a corresponding manner, the third rolling stand 8 is provided with an adjusting element 80.

Further, in this embodiment, the rolling stand 6
Are two horizontal rolls 50, 52 which can be reduced independently of each other.
have. Correspondingly, in the present embodiment, one module of the adjusting element 76 is attached to each of the horizontal rolls 50 and 52.

When the rolling path 1 is operated, the control unit 72
Sends the target values SW for the operating parameters of the rolling stands 4, 6, 8 to the adjusting elements 74, 76, 80 assigned to these rolling stands. In this case, the control unit 7
2 is configured for a parameter as a guide amount characteristic of the profile 54. In this embodiment, the parameters relating to the horizontal rolls 10, 12 are coupled, the adjustment of the rolling gap 30 being made substantially symmetrically with respect to the reference plane given by the rolled material plane. Therefore, the energization of the horizontal rolls 10 and 12 is performed using only the coupled target value SW for the rolling gap 30. This is indicated in the figure by bracketing the first two modules. Or horizontal roll 1
0, 12 may be independently energized with the adjustment value. Correspondingly, the control unit 72 provides, for example, an adjusting element 74 attached to the first rolling stand 7 to the horizontal rolls 10,
The target value for the rolling gap 30 formed by 12 and the other target values for each vertical roll 18, 20 are sent.

The adjusting element 74 comprises a kind of lower adjuster hierarchy level for converting these set points into appropriate adjustment amounts for the associated first rolling stand 4. Therefore, the adjusting element 74 determines the operation parameter “rolling gap 30” based on the sent target value SW.
(Corresponding to the web thickness S of the double T-beam) is converted into appropriate adjustment values for positioning the horizontal rolls 10, 12 and / or the rolling forces of these horizontal rolls. These adjustment values can be newly converted to other appropriate adjustment values for the original adjustment amount as another lower regulator hierarchy level, that is, in particular, the operation in the hydraulic cylinder units 32, 34, 36, 38 It can be converted to the pressure of the medium. In a corresponding manner, the control unit 72 sends the target value SW for the rolling gap between the horizontal rolls 22, 24 and the vertical rolls 27, 28 to an adjustment element 80 attached to the third rolling stand 8.

The control unit 72 sends to the adjusting element 76 a target value SW for positioning the respective horizontal rolls 50, 52 in the vertical direction. Adjusting element 7 corresponding to this
At 6, the supplied target value SW is first converted into the original adjustment value, that is to say, in particular, into the pressure for the associated hydraulic cylinder.

At the same time, the control unit 72 sets the target value SW in accordance with the result (ergebnisorientier) so that the tolerance limit value when producing the deformed rolled material can be maintained inside the rolling path 1.
t) In order to make corrections, it is configured in consideration of the previous rolling process experience. In this case, the profile of the rolled material running out of the third rolling stand 8 during the operation of the rolling path 1 is detected via the measuring device 82, for example based on one profile characteristic value or a number of profile characteristic values. You. Here, the profile characteristic values are the actual web thickness S, the actual flange height FH, and / or the actual flange thickness FD. Such a detected profile of the running strip is compared by the control unit 72 with a target profile for the running strip stored, for example, in the memory module 84. Based on this comparison, the deviation between the actual rolling result and the preset (target) rolling result is determined. If the deviation exceeds a relatively small predetermined tolerance limit, the target value SW sent from the control unit 72 to the adjusting elements 74, 76, 80 is re-corrected. This re-correction is performed as a kind of "on-line correction" while the rolling process is still taking place, taking into account the position-dependent relative parameter changes within one rolled material. Thus, the re-correction essentially involves two influences (Beitrag), the first influence being a kind of "pre-setting" or pre-load, which is held constant during the rolling process and The influence of No. 2 is tracked and controlled as the "online correction" while the rolling process is in progress.

Considerations when modifying the target value SW are as follows.
The point that each rolling stand 4, 6, 8 affects the shift independently of the other rolling stands, and thus the rolling error. However, such error influences are present in a cumulative form when the rolled material runs out of the third rolling stand 8 and are therefore also detected cumulatively by the measuring device 82.
Nevertheless, in order to enable a thorough error correction without the use of additional measuring devices for detecting the profile of the rolled material, and thus to be able to maintain particularly small tolerance limits, the control unit 72 is The cumulative rolling error detected by the measuring device 82 is configured to be weighted and corrected. Therefore, the correction of the rolling error is carried out by correcting the target values SW, wherein each target value SW is based on the deviation determined between the actual state and the target state and takes into account the stand-specific weight factors. exerting a modified target value K _i was. In other words, set to modify the target value SW for I-th rolling stand 4,6,8, pre setting component of the corrected target value K _i is
Meanwhile it relies on the determined deviation relates the actual state and the target state in the rolled material which has been rolled, on the other hand, also on the weighting factor W _i assigned to each rolling stand 4,6,8-specific ing. Therefore, even when only the global error characteristic value exists as a result of the measurement by the measuring device 82, the individualized error correction suitable for the purpose can be performed.

[0037] Stand-specific weighting factor W _i is stored in the memory module 84 respectively update format, including experience based on relative error components of the respective rolling stand 4,6,8 in a previous rolling process In. Further, in the weighting factor _Wi , the type and type of each rolled material are considered. In other words, with respect to various types of rolled material, in the memory module 84, a separate set of stand-specific weighting factor W _i for roll stand 4, 6, 8 are separately accumulated. The weighting factor _Wi is regularly updated by a kind of "learning function",
New or additional experience is accumulated based on younger (new) rolling results.

[0038] In the case of a roll pair, such as an individual roll can be pressure independently of each other, the following control further the target value in consideration of the role-specific weighting factor W _i is performed. In other words, exerting a correction value K _i to the target value SW for each of the individual rolls can be pressure independently of each other. The correction value K _i is also deviation between the actual profile and the desired profile is determined, also the stand-specific weighting factors W _i and role-specific weighting factor W _i
Also depends on. For example, in the adjustment element 74,
Since the coupling target value SW assigned to the horizontal rolls 10 and 12 is converted into individual adjustment values, the adjustment element 7
4, in order to properly consider the specific weight factor W _i to the roll, the memory module 84 in a manner not shown
Is connected to The same is true for the adjusting elements 76,80.

The part of the rolling path 1 illustrated in the embodiment of FIG. 1 is particularly suitable for rolling a deformed rolled material by a so-called reversible rolling method. In this type of reversible rolling method, the rolled material passes through the rolling stands 4, 6, 8 many times. During the first penetration, the rolled material enters the first rolling stand 4 and sequentially passes through the rolling stands 4, 6, 8. The rolled material is stopped after exiting the last rolling stand 8 and guided to pass through the rolling stands 8, 6, 4 in the opposite direction. For such a pass called "stitch", appropriate operating parameters of the rolling stands 4, 6, 8 are newly set,
In particular, the rolling gap is reduced in particular until the overall thickness or width is reduced. After several passes in such a kind of pendulum-like movement, the rolled material can finally run out of the third rolling stand 8 in the original rolling direction and be supplied to other processes.

In such a reversible rolling method, it is particularly useful for the control unit 72 to update the individual target values SW so as to be temporally close to each other (zeitnah) in order to obtain an accurate rolling result. In this case, in particular each time the rolled material passes through the measuring device 82, the actual profile is determined as a function of the penetration or stitch and compared with the target profile for the respective penetration or stitch. In this way, during the rolling process, the deviation from the target state in the currently processed rolled material can be detected and corrected early. For this purpose, a correction value K _i for the target value SW in the control unit 72 is determined for the immediate penetration based on the previous penetration result. In this case, the immediately preceding penetration result is most important. The weighting factor W _i is, each of the rolling against occurred rolling error stand 4, 6, 8
In addition, the penetration that has just been performed or the penetration that is about to be performed is also considered in a special manner.

[Brief description of the drawings]

FIG. 1 is a diagram showing a part of a multi-stand rolling path provided with a control system.

FIG. 2 is a schematic view of a universal stand.

FIG. 3 shows a profile of a double T-beam.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Rolling path 2 Forward direction of rolled material 4,6,8 Rolling stand 10,12 Horizontal roll 14,16 Roll axis 18,20 Vertical roll 22,24 Horizontal roll 26,28 Vertical roll 30 Rolling gap 32,34,36, 38 Hydraulic cylinder unit 39 Rolling gap 40,42 Holding element 44,46 Hydraulic cylinder unit 50,52 Horizontal roll 54 Profile 56 Web 58,60 Flange 62 Double arrow 70 Control system 72 Control unit 74,76,80 Adjusting element 82 Measuring device 84 Memory module 86 Input / output module B Overall width FD Flange thickness FH Flange height L Web length K _i Correct target value S Web width SW Target value W _i Weight factor X Rolling direction

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Detlef Brauinung Germany Day 40724 Hilden Gustav Mahler Strasse 57 (72) Inventor Otmar Palzer Germany Day 41363 Jüchen Ginsterweg 1 (72) Inventor Hans Jürgen Reismann Germany Day 40489 Düsseldorf Zeppenheimer Dorf Strasse 21 F-term (reference) 4E002 AC03 BA04 CA11 4E024 AA09 CC01 CC03 DD16

Claims (9)

[Claims] 1. A method for operating a rolling path of a deformed rolled material, comprising rolling a rolled material into a plurality of rolling stands continuous in a rolling direction (x) and each having a plurality of work rolls. 4,6,8), each rolling stand (4,6,8)
6, 8) are converted into a plurality of target values (S
W), wherein the profile (54) of the rolled material that has run out is detected and compared with a target profile, and based on the deviation of the detected profile from the target profile, a stand-specific weight factor ( A method characterized by applying a modified target value (K _i ) to a target value or each target value (SW) of a rolling stand or each rolling stand (4, 6, 8) relating to W _i ). 2. A rolling stand or each rolling stand (4,
The target value (SW) for the web thickness and / or the flange height and / or the flange thickness of the rolled material is previously set for each of (6, 8), according to claim 1, characterized in that: Method. 3. The method according to claim 1, wherein the weight factor (W _i ) specific to each stand is predetermined in dependence on the rolled material. 4. The rolls of one rolling stand (4, 6, 8) are operated independently of each other based on a roll-specific target value (SW), and the detected profile (54) is deviated from the target profile. 4. The method according to claim 1, further comprising: applying a correction value (K _i ) to a target value or a respective target value (SW) of one roll with respect to the role-specific weight factor (W _i ). The method according to any one of the above. 5. The method as claimed in claim 1, wherein the correction values or each correction value (K _i ) are limited to a parameter-specific maximum value. 6. The method according to claim 1, wherein the correction values or the respective correction values (K _i ), in particular the stand-specific weighting factors (W _i ), are preset on the basis of the rolling results of the preceding and previous rolling process. A method according to any one of claims 1 to 5. 7. When a rolled material is passed through a rolling path (1) a plurality of times, each correction value (K _i ) is set in advance based on the result of past rolling. Item 7. The method according to any one of Items 1 to 6. 8. correction value for the horizontal pressure of one rolling stand (4,6,8) and _{(K i),} corrections to the vertical pressure of one rolling stand (4,8) and _{(K i)} pre 8. The method according to claim 1, further comprising setting the ratio of the correction values (K _i ) to a maximum value that can be set in advance. 9. A deformed roll wherein the rolled material is guided by a plurality of rolling stands (4, 6, 8) which are continuous in the rolling direction (x) and each have a plurality of work rolls. A control system for a rolling path (1) for a material, wherein a target value (S) of an operating parameter is set for an adjusting element (74, 76, 80) assigned to one rolling stand (4, 6, 8).
W) wherein said control system comprises a control unit (72) for presetting W), wherein the control unit (72) detects, at the input side, a profile characteristic value of the run-out rolled material and a memory module (84). Connected to the control unit (72)
A memory module (84) based on the deviation of the detected profile characteristic value from the target profile characteristic value.
Stand-specific weight factors (W _i ) stored in
A control system characterized by applying a corrected target value (K _i ) to a target value (SW) of each of the rolling stands (4, 6, 8).